A tragic update to the story of a missing man who left a Copperstown medical facility against doctor’s advice. Matt Sisson has been found dead after a massive search effort lasting nearly a week. Sisson had been taken to Bassett Hospital with a burst appendix, but left the facility, even with an IV port still in his arm. Just before noon on Friday, a member of the Otsego County Sheriff’s Office found Sisson’s body in the Susquehanna River, not far from the hospital.